Drill-rod coupling.



PATBNTED APR. 10, 1906.

V. G. SMITH.- DRILL ROD COUPLING. APPLICATION FILED APR. 20, 1905.

Attorneys fyWlTE 111:

srAr ns Parnivr errren.

VOORHEES G. SMITH, OF IOLA, KANSAS, ASSIGNOR OF ONE-FOURTH TO DANIEL B. D. SMELTZER AND ONE'FOURTH TO GEORGE D. SMELT- ZER, OF IOLA, KANSAS.

DH! LL-HOD No. 817,398. Specification of Application filed April 20,

To wZZ whom it may concern:

Be it known that I, Voonnnns G. SMITH, a citizen of the United States, residing at Iola, in the county of Allen and State of Kansas, have invented a new and useful Drill-Rod Coupling, of which the following is a specification.

This invention relates to drillrod couplings, and has for its principal object to provide a novel means for insuring a rigid connection between the adjacent sections of .drill-rods and similar devices.

With this and other objects in view, as will more fully hereinafter a apear, the invention consists in certain novel i'eatures of construction and. arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended. claims, it being understood that various changes in the form, proportions, size, and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings, Figure 1 is a side elevation of two parts of a drill-rod provided with connecting devices in accord ance with the invention. Fig. 2 is a sectional elevation of the same. Fig. 3 is a sectional plan view of the device on the line 3 3 of Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

In the .coupling of drill-rod sections it is important that the connection be perfectly rigid and secure, that accidental separation of the parts due to independent twisting or tdrning of the sections or to jar be prevented, and that the fastening means be arranged wholly within the limits of the greatest diameter of the drill-rod.

In carryingout the present invention each section of the drill-rod is provided at one end with a socket and at the opposite end with a threaded. stem arranged to enter the socket.

The section 10 is shown as provided with a socket 11, and the section 12 has a threaded stem 13, tapered in form and provided on its tapered face with a continuous screw-thread.

fitting in a corresponding female thread in COUPLING.

Letters Patent. Patented April 10, 1906.

1905. Serial No. 256,618.

the wall of the socket 11. At the top of the threaded portion the stem is provided with an annular groove 14, semicircular in crosssection, and the end of the stem extends slightly above this screw and is arranged to seat flat against the correspondingly-shaped inner-end of the recess, the parts being so proportioned that when the stem is screwed home the head of the stem will rest against the inner wall of the recess, and the adjacent ends of the coupling-rod sections at points outside the threaded stem will abut against each other.

The section 10 is provided. with a radiallyextending threaded opening 15 for the reception of a locking -screw 16, having a semispherical head that fits within the groove 14, the projecting end. of the screw being of rectangular or other non-circular form for engagement by awrench, and the head is further provided with a diametrically extending opening for a cotter-pin 17 of the usual construction. The head 16 and the cotter-pin are arranged within a recess 18, surrounding the head, said recess being of such depth that no portion of the head can protrude beyond the line of the outer face of the drill-rod sections. The recess 18 is circular for the most part, its minor diameter being greater than the length of the cotter-pin, so that if the latter is drawn through the opening in the head 16 until its enlarged head is adjacent the circular wall of the recess the cotter-pin and bolt may both be freely turned until the end of the bolt has entered the groove 14. The wall of the recess 18 is provided with a plurality of notches 19, into any one of which the end of the cotter-pin may be introduced, there being a plurality of openings shown in order to provide for wear.

WVhen the parts are being assembled, the stem 13 is screwed into the recess 11 and then the bolt 16 is partly turned into threaded opening 15. The eotter-pin is then extended through the opening before the head 16 has passed into the recess, and the cotter-pin and bolt are then turned. together until the end of the bolthas fully entered. the recess or groove 14. The cotter-pin is then moved diametrically of the bolt-head until one of its ends has entered one of the recesses 19, and the parts are thus firmly locked in place, there being no danger of separation of the sections or of the outward movement of the lockingbolt to a position where its head would be likely to catch in the wall of the opening being formed. 1

Having thus described the invention, What is claimed is 1. In a rod-coupling, a rod having at one end a recess tapered for the greater portion of its length and provided with an internal thread, said rod being further provided with a radially-disposed set-screw-receiving opening and having at its periphery a recess surrounding the wall of the opening, the wall of said recess being provided with a plurality of notches, a second drill-rod section having a threaded stem tapered for the greater portion of its length and provided near its extreme inner end with an annular groove, a set-screw extending through the radial opening and entering said groove, the head of the setscrew having a diametrical opening, and a cotterpin arranged in said diametrical opening and movable in the direction of its length to introduce one of its ends into locking engagement with any one of the notches, the pin when free from the notches having unrestricted revoluble movement to permit adjustment of the set-screw.

2. In a drill-rod coupling, a rod-section having at one end a tapering recess provided with an internal thread, a second section having a threaded stem entering said recess and provided with an annular groove, a set-screw extending through an opening in the first section and entering said groove, the periphery of said second section being provided With a recess through which the head of the setscrew extends, and the wall of said recess being notched, and a cotter-pin carried by the head of the set-screw and movable in the direction of its length into locking engagement with said notch, the pin when moved in the opposite direction being freelyrevoluble within said recess to permit adjustment of the setscrew.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

VOORHEES G. SMITH.

Witnesses:

WV. H. HAM LTON, O. M COLE. 

